Decreasing the combustibility of polyolefins using microencapsulated fire retardants

Abstract

A method of decreasing the combustibility ofpolyolefins by incorporation of microencapsulatedfire retardants (ME FR) in the polymer melt was developed. It was found that PE and PP containing ME FR in PE and polyvinyltriethoxysilane (PVTES) shells belong to the category of difficult to burn materials. The study of the thermophysical and physicochemical characteristics of modified PE and PP demonstrated the major possibility of realization of the method for fabrication of polyolefins with a low fire hazard.

Thermo‐physical properties of polypropylene fibers containing a microencapsulated flame retardant

“…Microencapsulated FRs have attracted more and more attention since the end of the 1990s, and in the initial phase, the materials were used in order to overcome the modification of the textile properties such as softness and drape, to avoid undesirable properties, i.e. their chemical activity, volatility or migration to the polymer surface, and afterwards the application was mostly focused to improve their compatibility with the polymer matrix . The choice of the polymer for the membrane synthesis of the microcapsules is linked to the considered application and the required material processes.…”

“…their chemical activity, volatility or migration to the polymer surface, [14] and afterwards the application was mostly focused to improve their compatibility with the polymer matrix. [15][16][17] The choice of the polymer for the membrane synthesis of the microcapsules is linked to the considered application and the required material processes. In the textile field, the polymers used should have good thermomechanical properties to resist to the thermal and mechanical requests during the implementation processes, and also, during the daily use by the wearer.…”

Development and characterisation of flame-retardant fibres from isotactic polypropylene melt-compounded with melamine-formaldehyde microcapsules

“…In order to overcome this problem, Reshetnokov et al [7,8] have shown that standard fire retardants should be microencapsulated beforehand to improve their compatibility with polypropylene (PP) matrix, and that the selection of an appropriate shell not only prevents contact of the IFR with the environment, but can also increase its efficiency. Moreover, microencapsulation of the IFR reduces its moisture sensitivity by decreasing its water absorption and increasing its water resistance in a polymeric matrix [9e12].…”

Application of Flame-Retardant Double-Layered Shell Microcapsules to Nonwoven Polyester

“…Since the end of the 1990s, microencapsulation of flame retardant compounds in the textile area has been recognized to be an effective method not only to bring new functionalities to the substrate but also to overcome some problems of FR systems such as a weak water resistance, poor compatibility, toxicity, poor thermal degradation, etc. [ 15 , 16 , 17 , 18 ], or the modification of the textile properties such as softness and drape [ 19 ], to avoid undesirable properties, i.e., their chemical activity, volatility, or migration to the polymer surface. Furthermore, the encapsulation step leads to an increase of the heat transfer area, to a decrease of the reactivity of the core materials to reduce the interference with other material parameters, and to enhance the low heat conductivity and to make the manipulation of FR easier [ 20 ].…”